H1
Swan
Cavity Sensor High Temperature Error
Microwave displays H1 and stops heating, often shortly after starting.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Shorted cavity temperature sensor, Sensor wiring short to chassis, Control PCB misreading sensor, Operating with no load (empty cavity)
How to Fix / Troubleshooting
Safety: Unplug the microwave before internal inspection.
- Step 1 – Avoid running empty: Never run the microwave with no food or water inside; this can cause rapid overheating and sensor errors. Test with a cup of water.
- Step 2 – Inspect sensor wiring: Remove the outer cabinet and locate the cavity sensor. Check that its wires are not pinched or touching metal parts.
- Step 3 – Test sensor: Disconnect the sensor and measure resistance at room temperature. A very low resistance (near 0 Ω) indicates a shorted sensor. Replace if out of specification.
If a new sensor does not clear H1, the control PCB may be defective.
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Repair Difficulty
Hard
4/5
Required Part
Cavity Temperature Sensor
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